I’ve had my Leer camper shell with electric lock for the hatch for six months. All was good. Then one day I happen to check the tailgate and it wasn’t locking anymore. Just the glass was locking and unlocking with the factory remote. Took it to my GMC dealer and they undid the wires that were t-tapped in the tailgate lock. The lock and unlock on the tailgate worked again. Everything else was a plug and play harness for the cap. Tried Posi-Taps and had the same results. I’ve heard the drivers side door rocker area has wires to tap into. With that said where did your dealer get the signal for the lock at? Could the module that unlocks the hatch be bad. Going to the Leer dealer this weekend to see what they can find but they say they never had any issues on the K2 trucks.